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No. 625,643. y Patented may 23,- |899. T. A. coFFm. HISTING APPARATUS.

( Appucation med Feb. .20, 1599.)

4 Sheets-Shef I (No Model.)

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fno. 625,643. Patented may 23,1899.

T. A. coFFlN.

HOISTING APPARATUS.

(Application tiled Feb: 20, 1899.) (No Model.) 4 Sheets-Sheet 2.

Q.NESSEy INVENTOR mok/m5 mwoRY 00PM!f HISATTORNEYS,

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Patented May 23, |899. T. A. COFFIN. u HOISTING APPARATUS.

(Application filed Feb. 20, 1899.)

4 Sheets-Sheet 3.

(No Model.)

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HIS ATTORNEYS No. 625,643. Patented May 23,1899.

\ T. A. cuFHN.

HOISTING APPARATUS.

(Application led Feb. 20, 1899.) y(NoMmjel.) 4 Sheets-Sheet 4.

WITNESSES: INVENTOR.

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HlSATTORNEYS.

N-iTED STATES PATENT. OFFICE.

THOMAS AMORY COFFIN, OFl NENV YORK, N. Y.

HOISTING APPARATUS.

SPECIFICATION forming part of Letters Patent No. 625,643, datedA May 23, 1899.

Application led February 20, 1899. Serial No. 706,245. (No model.)

To all whom, t may concern:

Be it known that I, THOMAS AMoRY Comun, a citizen of the United States ot' America, residing in West New Brighton, Staten Island, borough of Richmond, New York city, New York, have invented an Improved Hoisting Apparatus, of which the following is a specification.

My invention has reference more particularly to that class of hoisting apparatus in which an overhan ging boom is emp1oyed-as, for instance, hoisting apparatus of the type commonly known under the name of the Boston tower-used for unloading canal and other boats and transferring coal, grain, 6to., from such boats to storage-bins,cars, dac. In such apparatus there is provided a'vertical framework or tower, either a fixture or mounted upon wheels, upon a wharf, float, or elsewhere, and upon this tower is mounted a hori- `zontally-projecting boom upon which a truck can be traversed between the tower and the outer end of the boom. This truck carries a sheave or sheaves, over which the hoistingrope passes for the raising and lowering of the clam-shell bucket, tub, skip, or other loadcarrier.' The sheave-truck is-to -be held out near the end of the boom during the first part of the lift of the carrier, and afterward it has to be moved in toward the tower, where finally it is brought over a hopper, into which the load is discharged. The sheave-truck and empty carrier are then traversed outward again to the end of the boom, and the carrier is let down into the hold of the boat or wherever it has'to be loaded. Commonly this inboard and outboard travel of the sheave-truck on the boom is controlled by a hoisting-drum supplementary to the main hoisting-drum in the tower; but this requires the presence of a second man to manipulate the second hoist. In some cases a counterbalance has been connected with the truck to cause the inboard travel of the latter; but that construction has not proved satisfactory. f

By my invention `the inboard and outboard travel of the s'heave-truck is effected by raising and lowering the boom upon its pivot at the proper times through the load-hoisting mechanism. I

In. the accompanying drawings, Figure I is a side elevation of the upper part of such a hoisting apparatus embodying myinvention.

Fig. 2 isa front elevation of the same, but showing also the lower part of the frame or tower. Fig. 3 is a side elevation similar to Fig. I, but showing a modification; and Fig. 4 is a View of another modification.

Referring to Figs. l and 2, A A is the frame work or tower, which may be a tiXture on a wharf, float, or other situation; but in Fig. 2 I have shown it as mounted upon Wheels a ct to run on rails, as is common. In this tower is a suitable receiving-hopper H, below which there may be any suitable conveying means. In the present instance I have shown a trolley-car K to receive its load from the hopper and then run oit to any suitable delivery-point at a distance. At any suitable point on the frame there is also provided a hoisting-drum D, from which runs the hoisting-rope d over a sheave d2 near the peak of the tower.

B is the outwardly-projecting boom, which is mounted so asvto be capable of swinging vertically upon a pivot ZJ on the tower, and it may also be mounted so as to be adjustable horizontally on a vertical pivot b', Figs.` 3 and 4, so as to accommodate varying hatches in boats. The outer end of the `boom issustained by a three-part ropeE, passing around the sheave e, carried by the peak of the tower, and the two sheaves e and e2, connected to the outer end of the boom. One end of this rope is connected to the tower-peak directly or through the sheave or block e, and thence the rope passes around the sheave e back toward the tower and around the sheave e and thence toward the boom and around the sheave e2, with itsend connected to the sheavetruck R', which travels on the boom. This 'truck runs on wheels r on the boom Band carries a sheave F, over which passes the Vhoisting-rope d', the bucket, tub, sk.ip,.or

other carrier C being suspended from this hoisting-rope. The boom B may be sustained against lateral strain by guy-ropes F', connecting the outer end of the boom with a cross-beam b2 on the tower a proximate] in line with the pivot of the boom, Figs. I and 2.

The parts are so balanced that the inward pull on the truck R, caused by the angle of the hoisting-rope and the weight of the carrier and its load, with a resultant pull in the direction of the arrow, Fig. I, is more than balanced by the outward pull on the ropeE, caused by the weight of the boom and its IOO load-that is to say, the rope E will keep the` sheave-truck R out against the stop-chocks S, as shown in Fig. 1, even when the carrier is loaded and prevent the loaded carrier from traveling inward and downward to wreck the tower-frame. Therefore when the hoistingdrum D is set in operation the carrier will be drawn up with its load in a vertical direction tions indicated by dotted lines in Fig. 1, with the carrier over the receiving-hopper. As soon as the carrier is emptied and the strain on the hoisting rope slightly relaxed the weight of the boom acting through the rope E will draw the truck and carrier out again to the positions shown by full lines in Fig. 1.

To provide the necessary equilibrium or balance during the inboard travel of the truck R, it is desirable, if not necessary, that the track on which the truck travels shall be curved. This may be provided for by curving the boom B itself, or it may be provided for by employing with a straight or other suitably-shaped boom B', Fig. 4, a double ropeway B2 for the track of the truck R. Although at any given lnoment the ropes of this ropeway present angular lines, as shown in Fig. 4, the line of travel of the truck R with reference to the beam B', for instance, is a curved one, as will be understood.

In Fig.3Ihave shown substantially the same construction as already described with reference to Figs. l and 2, but with an additional means,whereby the inboard travel of the truck and carrier may be started sooner than in the construction shown in Figs. 1 and 2, with the result of getting a practically straight path of travel for the carrier from the point where it clears the hatch of a boat to a point over the hopper. For this purpose I provide a secondary hoisting-rope G to aid in raising the boom, but provided with a slack loop and counterweight to delay the raising of the boom until the load has cleared below. As a convenient way of doing this I hook up to the second turn of the three-part rope lil-say at Fig. S-the rope G, which thence passes up to and around a sheave g, carried by the peak of the tower, thence around a guidesheave g', and thence down and around a sheavej on a bob or counterweight J. From this sheave g the rope G passes upward again, preferably around a guide-sheave g', to a drum D on the same shaft as the main hoisting-drum D. The counterweight J is guided by vertical guidesj and can rise to the position shown by dotted lines, where it will be arrested by contact with a fixed part of the framework. At the beginning of the hoistlowered position, as shown by full lines, and the rotation of the hoisting-shaft, while causing the carrier to rise vertically out of the boats hold, will not cause the rope G to pull on the rope E until the counterweight J has been drawn up to the position shown by dotted lines. Then the loaded carrier being clear of the boat, the rope G will begin to pull on the rope E and allow the sheave-truck R to move in toward the tower in proportion to the rise of the carrier, which takes a practically straight course to a position over the hopper H.

I claim as my invention- 1. A hoisting apparatus having a framework and load-hoisting means with a verticallyswinging boom, a traveling sheavetruck on the latter, connections between the boom and hoisting means, whereby the latter raises and lowers the boom, and means whereby the travel'of the truck is controlled by the raising and lowering of the boom.

2. A hoisting-apparatus having a framework, a load-hoisting means, a verticallyswinging boom, and a traveling truck on the latter in combination with sheaves and a rope connecting the peak of the frame, the end of the boom and the traveling truck to normally sustain the boom in a balanced position, and connections between the boom and hoisting means, whereby the latter raises and lowers the boom to cause the inboard and outboard travel of the truck.

3. A hoisting apparatus having a framework and load-hoisting means, a verticallyswinging boom and a traveling truck on the latter in combination with connections between the hoisting means and the boom,

whereby the latter raises the boom and causes' the inboard travel of the truck, and devices whereby said travel is started as soon as the load has cleared below, substantially as described.

4. A hoisting apparatus having a framework and hoisting means with a verticallyswinging boom, a traveling sheave-truck on the latter, sheaves and a rope connecting the peak of the frame, the end of the boom and the traveling truck, a secondary hoisting-rope to aid in raising the boom, but provided with a slack loop and counterweight, substantially as described.

5. A hoisting apparatus having a framework and a load-hoisting means, a verticallyswinging boom having a curved trackway and a traveling sheave-truck on the latter, in combination with connections between the boom and hoisting means, whereby the latter raises and lowers the boom, and means whereby the travel of the truck is controlled by the raising and lowering of the boom.

In testimony whereot` I have signed my name to this speciication in the presence of two subscribing witnesses.

' THOMAS AMORY COFFIN.

Vitnesses:

J ULIUs KAHN, ROBERT D. WHITE.

IOO

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